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Bike Lock Buying Guide: How to Choose the Right Lock

Collections Bike Lock Buying Guide: How to Choose the Right Lock

Locking a bike to a city bike stand with a D-lock

Protect Your Bike with Confidence

Balance security, portability and price to find a lock that fits your bike and the way you ride.

Choosing a bike lock is mostly a balance between the security you need, the weight you are willing to carry and your budget. Where you leave your bike, how long it will be unattended and its value all affect the right choice.

The best lock is not simply the strongest or most expensive. It needs to provide suitable protection while remaining practical enough that you use it and take it with you, if required. Home security matters too, where a heavier lock and a permanent anchor may be more useful than portability.

This guide starts with security ratings before comparing lock types, correct locking technique and options for protecting a bike at home.

Start with the security level

Sold Secure independently tests locks against tools and methods used by thieves. Its bicycle security ratings run from Bronze to Diamond. A rating measures tested resistance; it does not make any lock theft-proof.

Diamond

The highest Sold Secure bicycle rating, intended for maximum resistance in the highest-threat environments. A strong choice for high-value bikes and e-bikes, city parking, stations and long unattended periods. Diamond products commonly include robust D-locks, heavy chains and ground anchors.

Gold

A high level of resistance against a dedicated thief. Gold is a practical everyday choice for commuting, valuable bikes, busy public places and longer daytime stops, often with less weight than the heaviest Diamond options.

Silver

A compromise between security, portability and cost for higher-risk situations. Silver can suit lower- to mid-value bikes, shorter stops and riders who prioritise manageable weight. It can also work well as a second lock.

Bronze

Protection primarily against opportunist theft. Bronze locks are generally best for lower-value bikes, brief stops in normal-risk locations, or supplementary protection for a wheel or accessory.

Remember: rating and lock type are different

A D-lock is not automatically more secure than every folding lock or chain. Ratings apply to the particular model tested, so compare the certification of the exact product rather than judging it by shape, thickness or brand alone.

Security versus portability

Higher security usually requires more hardened material, which can increase weight, bulk and price. A heavy chain may be ideal in a garage or at a workplace where it can stay in one location, but inconvenient to carry on every ride.

A compact D-lock often gives strong protection for its weight, while folding and wearable locks can provide more reach or easier carrying. Many riders benefit from a portable primary lock, a lighter secondary lock and a heavier home-security setup.

Female cyclist secures her bike to a railing with a portable chain lock

Which type of bike lock should you choose?

Choose the security rating first, then find the lock style that works with your regular parking places and the way you carry it.

D-locks

D-locks, also called U-locks, usually offer an excellent balance of strength, weight and price. Their rigid shape leaves less room for thieves to manoeuvre tools when fitted closely around the bike and stand.

What to look for

  • A rating suited to the bike and location
  • An opening large enough for your usual stands
  • A frame mount if you plan to carry it on the bike
  • A close fit that limits leverage space
D-lock securing an electric bicycle frame to a stand

Chain locks

Chains can wrap around larger posts, awkward anchor points or more than one bike. Link thickness, material, padlock design and the complete product's rating all affect security.

Heavy Diamond-rated chains are excellent for a regular home or workplace location. Lighter chains are easier to carry, but the reduction in weight often comes with lower attack resistance.

Securing a bike to a stand with a mid-weight chain lock

Folding locks

Folding locks collapse into a compact holder and normally provide more reach than a small D-lock. They are convenient to mount on a bike and useful when conventional stands are awkward to access.

Security varies considerably, so check the individual Sold Secure rating. Also consider folded size, overall reach, weight and whether the supplied bracket fits your frame.

Unfolding a folding bicycle lock ready to secure a bike

Wearable locks

Wearable chains and flexible locks are designed to make security easier to carry. Depending on the model, they can be worn around the waist or over the shoulder, keeping the bike's bottle mounts and storage space free.

What to look for

  • The exact Sold Secure rating
  • A comfortable fit in riding clothing
  • A safe quick-release design where applicable
  • Enough reach for your usual locking points
Cyclist fastening a wearable bicycle lock around their waist

Cable locks and lightweight security

Cable locks are flexible, inexpensive and easy to carry, but most provide less resistance than a substantial D-lock or chain. They are best used for very brief, low-risk stops, low-value accessories or as secondary protection for a wheel.

An extension cable can help secure a second wheel alongside a strong primary lock, but it should not be assumed to share the main lock's rating. Lightweight Z-locks are useful for supervised café stops, helmets or extra deterrence—not as the sole protection for an unattended valuable bike.

Cable lock securing a bike with its owner at a table nearby

Key or combination?

A combination mechanism can be convenient if you do not want to carry a key, and it is available across several physical lock types. Treat it as an operating preference rather than a security grade: compare the exact model's construction and Sold Secure rating.

If you choose one, use a code that is difficult to guess and avoid entering it where somebody can easily watch. Browse our combination locks to compare the available styles.

Classic bicycle secured at a cycle stand with a D-lock

How and where to lock your bike

Even a highly rated lock works best when it secures the right parts of the bike to a genuinely immovable object.

Lock the frame

Pass the primary lock through the frame and a solid cycle stand or anchor. Locking only a wheel can leave the rest of the bike vulnerable.

Secure both wheels

Use a second lock, secure skewers or remove a quick-release front wheel and lock it together with the frame and rear wheel.

Fill the available space

Fit the lock closely around the bike and stand, and keep it away from the ground. Less empty space makes leverage attacks harder.

Choose the location

Use recognised cycle parking in a busy, well-lit place, ideally covered by CCTV. Check that the stand cannot be cut, lifted or removed.

Should you use two locks?

For higher-value bikes or higher-risk places, use two quality locks, preferably of different types, with at least one strong D-lock. This protects more of the bike and can require a thief to carry and use more than one type of tool.

A common arrangement is a D-lock through the frame and rear wheel, with a chain, folding lock, second D-lock or extension cable securing the front wheel.

E-bike secured with a D-lock and chain

Where do frame locks fit?

Frame locks are commonly fitted to hybrid, urban and Dutch-style bikes. They immobilise the rear wheel, which helps prevent somebody simply riding away, but on their own they do not secure the bike to anything.

Use one as secondary protection or for a very brief, supervised stop. Some models accept a plug-in chain or cable that lets you connect the bike to a fixed object.

Securing your bike at home

A locked garage or shed is not enough on its own. Attach the bike to a properly installed ground or wall anchor using a strong chain or D-lock. At home, where the lock can stay in place, weight is less important and a heavier setup is often practical.

The anchor, lock and structure all need to be suitable. Fit the anchor to sound concrete, masonry or another approved surface, following its installation instructions, and check the ratings of the anchor and lock separately.

E-bike secured to a ground anchor with a D-lock and chain at home

Check your insurance requirements

If your bike is insured, check the policy before buying a lock. The insurer may specify a minimum Sold Secure rating, how the bike must be secured, what it can be locked to and different rules for home and away.

Ask yourself

  • ☐ Does my policy require a particular Sold Secure rating?
  • ☐ Must the frame be attached to an immovable object?
  • ☐ Are there different conditions overnight or in an outbuilding?
  • ☐ Does the policy limit how long the bike can be left unattended?

Quick recommendations

SituationStarting pointWhy
High-value bike or e-bike in a cityDiamond lock, often with a second lockMaximum tested resistance for a high-threat environment
Daily commutingGold D-lock, folding lock or wearable lockStrong security with manageable carrying options
Shorter, lower-risk stopsSilver or Bronze rated lockA lighter compromise where the risk and bike value justify it
Garage or shedGround anchor and heavy chain or D-lockPortability matters less and the bike is fixed to the building
Supervised café stop or accessoriesLight cable or Z-lockConvenient deterrence where a full primary lock is not required

Bike lock FAQs

What is the best Sold Secure rating?

Diamond is the highest bicycle rating, followed by Gold, Silver and Bronze. The best choice for you still depends on the bike, location, time unattended, insurance requirements and how the lock will be carried.

Is a D-lock always the most secure option?

No. D-locks often provide strong security for their weight, but chains, folding locks and flexible locks are available at different ratings. Compare the certification of the exact model.

Can I secure my bike with a cable lock?

A cable can suit brief, low-risk and supervised situations or act as secondary protection. Most lightweight cables should not be the only lock used for a valuable bike left unattended in public.

Do I need two bike locks?

Two locks are advisable for valuable bikes and higher-risk parking. Different lock types can protect more of the bike and force a thief to use more than one type of tool.

What lock should I use for an e-bike?

The higher value of many e-bikes normally justifies a Diamond or strong Gold lock, often combined with a second lock. Check the insurer's requirements and remove the battery or display when practical.

Does an extension cable have the same rating as my D-lock?

Not necessarily. Certification may cover only the primary lock. Treat an accessory cable as additional protection unless the complete configuration is explicitly approved.

Ready to find your bike lock?

Explore locks for everything from lightweight everyday deterrence to maximum-security home and city use.
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